pvlib.singlediode.estimate_voc¶
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pvlib.singlediode.estimate_voc(photocurrent, saturation_current, nNsVth)[source]¶ Rough estimate of open circuit voltage useful for bounding searches for
iofvwhen usingsinglediode().- Parameters
photocurrent (numeric) – photo-generated current [A]
saturation_current (numeric) – diode reverse saturation current [A]
nNsVth (numeric) – product of thermal voltage
Vth[V], diode ideality factorn, and number of series cellsNs
- Returns
numeric – rough estimate of open circuit voltage [V]
Notes
Calculating the open circuit voltage, \(V_{oc}\), of an ideal device with infinite shunt resistance, \(R_{sh} \to \infty\), and zero series resistance, \(R_s = 0\), yields the following equation [1]. As an estimate of \(V_{oc}\) it is useful as an upper bound for the bisection method.
\[V_{oc, est}=n Ns V_{th} \log \left( \frac{I_L}{I_0} + 1 \right)\]